If a genetic disease is transferred from a phenotypically normal but carrier female to only some of the male progeny, the disease is:
a. Autosomal dominant
b. Autosomal recessive
c. Sex-linked dominant
d. Sex-linked recessive
The answer is the option (d) Sex-linked recessive
Explanation: Here, the X-chromosome has the flawed gene, but the carriers of the disease are females and it is manifested in males. Thus, it is referred to as sex-linked recessive disease. One example of such a disease is Haemophilia which is known as X-linked recessive disease.